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Back in February I had Kooks LT Headers, Hi flow cats, X pipe and Kooks Off road mufflers installed. A CEL came on and stayed on which I expected because of the O2 sensors being overloaded by the new exhaust setup. Now (five months later) without doing anything else to the car. The CEL has turned itself off. Can the ECU make adjustments because the O2 overload is now the Norm for the car? Has this happened to anyone else?
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